考點(diǎn):整數(shù)的加法和減法,小數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)根據(jù)乘法交換律和結(jié)合律進(jìn)行簡算;
(2)根據(jù)加法交換律和結(jié)合律進(jìn)行簡算;
(3)根據(jù)減法的性質(zhì)進(jìn)行簡算;
(4)先算減法,再算乘法,最后算加法;
(5)先算乘法和除法,再算減法;
(6)根據(jù)乘法分配律進(jìn)行簡算.
解答:
解:(1)15×25×8×4
=(15×8)×(25×4)
=120×100
=12000;
(2)18.2+1.57+2.8+0.43
=(18.2+2.8)+(1.57+0.43)
=21+2
=23;
(3)51.27-8.66-1.34
=51.27-(8.66+1.34)
=51.27-10
=41.27;
(4)54+8×(24-17)
=54+8×7
=54+56
=110;
(5)27×2-48÷3
=54-16
=38;
(6)96×37+37×3+37
=(96+3+1)×37
=100×37
=3700.
點(diǎn)評(píng):考查了運(yùn)算定律與簡便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律簡便計(jì)算.